#!/usr/bin/env python
# -*- Mode: python; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with this program; if not, write to the Free Software Foundation, Inc., 51
# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# Copyright (C) 2013 Aleksander Morgado <aleksander@gnu.org>
#

import os
import sys
import optparse
import json

from ObjectList import ObjectList
import utils

def codegen_main():
    # Input arguments
    arg_parser = optparse.OptionParser('%prog [options]')
    arg_parser.add_option('', '--input', metavar='JSONFILE',
                          help='Input JSON-formatted database')
    arg_parser.add_option('', '--output', metavar='OUTFILES',
                          help='Generate C code in OUTFILES.[ch]')
    (opts, args) = arg_parser.parse_args();

    if opts.input == None:
        raise RuntimeError('Input JSON file is mandatory')
    if opts.output == None:
        raise RuntimeError('Output file pattern is mandatory')

    # Prepare output file names
    output_file_c = open(opts.output + ".c", 'w')
    output_file_h = open(opts.output + ".h", 'w')
    output_file_sections = open(opts.output + ".sections", 'w')

    # Load database file contents
    database_file_contents = utils.read_json_file(opts.input)

    # Build message list
    object_list_json = json.loads(database_file_contents)
    object_list = ObjectList(object_list_json)

    # Add common stuff to the output files
    utils.add_copyright(output_file_c);
    utils.add_copyright(output_file_h);
    utils.add_header_start(output_file_h, os.path.basename(opts.output))
    utils.add_source_start(output_file_c, os.path.basename(opts.output))

    # Emit the message creation/parsing code
    object_list.emit(output_file_h, output_file_c)

    # Emit sections
    object_list.emit_sections(output_file_sections)

    utils.add_header_stop(output_file_h, os.path.basename(opts.output))

    output_file_c.close()
    output_file_h.close()
    output_file_sections.close()

    sys.exit(0)


if __name__ == "__main__":
    codegen_main()
